WO2021237947A1

WO2021237947A1 - Air-blowing micro-cable and preparation method therefor

Info

Publication number: WO2021237947A1
Application number: PCT/CN2020/108528
Authority: WO
Inventors: 赵静; 缪斌; 潘和平; 汪趁时; 缪小明; 谭枫
Original assignee: 江苏中天科技股份有限公司
Priority date: 2020-05-29
Filing date: 2020-08-11
Publication date: 2021-12-02
Also published as: CN111596427A

Abstract

An air-blowing micro-cable (100) and a preparation method therefor. The air-blowing micro-cable (100) comprises an outer sheath (50) and a cable core (10) provided in the outer sheath (50); the cable core (10) comprises optical fiber unit(s) (11) and reinforcing unit(s) (13) that are stranded; the total number of the optical fiber units (11) and the reinforcing units (13) is three; the optical fiber unit(s) (11) and the reinforcing unit(s) (13) are stranded in a one-way S mode; and a reinforcing layer (30) covers the periphery of the cable core (10). The air-blowing micro-cable (100) uses the cable core (10) formed by stranding the optical fiber unit(s) (11) cured by a resin and the reinforcing unit(s) (13), so that the rigidity of the optical cable is effectively improved; then the reinforcing layer (30) covers the cable core, so that the tensile strength of the air-blowing micro-cable (100) is further improved, and the bending risk of the air-blowing micro-cable (100) is reduced; the air-blowing micro-cable is suitable for rapid long-distance air-blowing laying, and the construction laying efficiency is improved.

Description

Air blown microcable and preparation method thereof

Technical field

This application relates to the technical field of microcable design, in particular to an air-blown microcable and a preparation method thereof.

Background technique

This section is intended to provide background or context for the implementation of the application stated in the claims. The description here is not recognized as prior art just because it is included in this section.

The air-blown micro-cable can effectively improve the utilization of pipeline resources and has high deployment efficiency. It has a wide range of applications in access networks, metropolitan area networks, and communication backbone networks. As a mature fiber optic cable network laying technology, the air-blown micro-tube micro-cable technology can effectively solve the problems of high performance investment cost for operators and the shortage of communication pipeline resources. All have large-scale applications. In the process of optical fiber broadband network construction, with the rapid development of FTTH, in terms of building integrated wiring, the air blown optical fiber unit has obvious advantages compared with the traditional sheathed optical cable. Its size, light weight, simple construction equipment, and rapid air blow Laying improves the efficiency of fiber optic cable construction and deployment, and at the same time facilitates pipeline expansion, reduces the workload of trenching and excavation, and saves construction costs. Therefore, it is often used for the "last mile" access of fiber-to-the-home networks.

The traditional air-blown optical fiber unit generally only has a sheath protection layer, and the rigidity is insufficient, and the tensile strength and lateral pressure of the optical cable are also poor. During the air-blown laying process, it is easy to cause micro-cables due to excessive air blowing speed or excessive pipeline pressure. Bending occurs, causing fiber breakage and damaging the optical cable.

Summary of the invention

In view of the above, it is necessary to provide an improved air-blown microcable.

The technical solutions provided by this application are:

An air-blown micro-cable includes an outer sheath and a cable core arranged in the outer sheath. The cable core includes a twisted optical fiber unit and a strengthening unit, the optical fiber unit and the strengthening unit The total number is three, the stranding method of the optical fiber unit and the strengthening unit is unidirectional S stranding, and the outer circumference of the cable core is covered with a strengthening layer.

In some embodiments of the present application, the optical fiber unit includes a plurality of optical fibers and a cured resin layer, and the cured resin layer covers the outer periphery of the optical fiber.

In some embodiments of the present application, the material of the reinforcement unit may be a glass fiber reinforced plastic rod or an aramid fiber reinforced plastic rod.

In some embodiments of the present application, the material of the reinforcement layer is aramid fiber or glass fiber yarn, and the thickness of the reinforcement layer is 0.1 mm to 0.2 mm.

In some embodiments of the present application, the reinforcing layer is filled with a water blocking unit, and the water blocking unit is a water blocking yarn filled in the reinforcing layer or a water blocking powder coated on the surface of the reinforcing layer.

In some embodiments of the present application, the surface of the outer sheath is provided with concave-convex patterns extending longitudinally of the air-blown microcable, and the circumferential array of the concave-convex patterns is arranged on the outer surface of the outer sheath.

Another object of this application is to provide a method for preparing an air-blown microcable, which includes the following steps:

Under the tension control, the optical fiber unit is combined and assembled as a whole to form an optical fiber unit;

Take the optical fiber unit and the strengthening unit and twist to form the cable core;

Stranding and covering the reinforcement layer outside the cable core;

The outer sheath is extruded on the outer circumference of the reinforcement layer to complete the preparation of the air-blown microcable.

In some embodiments of the present application, during the preparation process of the optical fiber unit, the resin is uniformly coated on the optical fiber, and then cured by ultraviolet light to form the optical fiber unit; the resin includes a photosensitive oligomer, a photosensitive monomer, a photoinitiator and an auxiliary agent .

In some embodiments of the present application, after the curing of the optical fiber unit is completed, the surface of the cured optical fiber unit is printed and identified.

In some embodiments of the present application, the stranding pitch of the optical fiber unit and the reinforcing unit is 300 mm to 500 mm.

Compared with the traditional air-blown optical fiber unit, the air-blown micro-cable provided by the present application effectively improves the rigidity of the optical cable by twisting the core of the optical fiber unit and the reinforcing unit, and then is coated with a reinforcement layer to further improve the tensile strength of the air-blown micro-cable , To reduce the risk of bending of the air-blown micro-cable, suitable for rapid and long-distance air-blown laying, and improve construction and deployment efficiency.

Description of the drawings

The application will be further described in detail below in conjunction with the drawings and specific implementations.

Fig. 1 is a schematic cross-sectional view of an air-blown microcable in an embodiment of the application.

Fig. 2 is a schematic cross-sectional view of an air-blown microcable in another embodiment of the application.

Fig. 3 is a schematic cross-sectional view of the air-blown microcable in the third embodiment of this application.

4 is a schematic cross-sectional view of the air-blown microcable in the fourth embodiment of this application.

Fig. 5 is an overall schematic diagram of an air-blown microcable in an embodiment of the application.

Symbol description of main components:

气吹微缆Air blown microcable	100100
缆芯 Cable core	1010
光纤单元 Fiber Unit	1111
光纤 optical fiber	111111
固化树脂层Cured resin layer	113113
加强单元 Strengthening unit	1313
增强层 Enhancement layer	3030
阻水单元 Water blocking unit	3131
外护套 Outer sheath	5050
凹凸纹路Concave-convex pattern	5151

Detailed ways

In order to be able to understand the above objectives, features and advantages of the embodiments of the application more clearly, the application will be described in detail below with reference to the accompanying drawings and specific implementations. It should be noted that, if there is no conflict, the features in the embodiments of the present application can be combined with each other.

In the following description, many specific details are set forth in order to fully understand the embodiments of the present application, and the described implementations are only a part of the implementations of the present application, rather than all of the implementations. Based on the implementation manners in this application, all other implementation manners obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the examples of this application.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field belonging to the embodiments of the present application. The terms used in the specification of the application herein are only for the purpose of describing specific implementation manners, and are not intended to limit the embodiments of the application.

The present application provides an air-blown micro-cable, which includes an outer sheath and a cable core arranged in the outer sheath. The cable core includes a stranded optical fiber unit and a strengthening unit, and the optical fiber unit is connected to the The total number of reinforcing units is three, the twisting method of the optical fiber unit and the reinforcing unit is unidirectional S-stranding, and the outer circumference of the cable core is covered with a reinforcing layer.

This application also provides a method for preparing an air-blown microcable, which includes the following steps:

Under the tension control, the optical fiber is combined and assembled as a whole to form an optical fiber unit;

Stranding and covering the reinforcement layer outside the cable core;

Extruded on the outer periphery of the reinforcement layer to form an outer sheath.

Compared with the traditional air-blown optical fiber unit, the air-blown micro-cable provided by this application effectively improves the rigidity of the optical cable by twisting the core of the resin optical fiber unit and the reinforcing unit, and then is coated with a reinforcement layer to further improve the tensile strength of the air-blown micro-cable. Strength, reduce the risk of bending of the air-blown micro-cable, suitable for rapid and long-distance air-blown laying, and improve construction and deployment efficiency.

The following specific implementations will further illustrate the embodiments of the present application in conjunction with the above-mentioned drawings.

1 and 2, an air-blown micro-cable 100 includes a cable core 10, a reinforcement layer 30, and an outer sheath 50. In one embodiment, the cable core 10 is disposed on the air-blown micro-cable 100 The reinforcing layer 30 is twisted and arranged on the outer periphery of the cable core 10, and the outer sheath 50 is formed on the outer periphery of the reinforcing layer 30 by extrusion molding. In one embodiment, the overall outer diameter of the air-blown microcable 100 is between 2.5 mm and 3.6 mm. In other embodiments, the overall outer diameter of the air-blown microcable 100 is between 3.4 mm and 4.0 mm.

3 and 4, the cable core 10 includes at least one optical fiber unit 11 and at least one strengthening unit 13, and the total number of the optical fiber unit 11 and the strengthening unit 13 is 3. In one embodiment, There are one optical fiber unit 11, two strengthening units 13, and one optical fiber unit 11 and two strengthening units 13 are twisted to form a cable core 10. In other embodiments, referring to FIG. 4, the number of optical fiber units 11 can also be two, the number of strengthening units 13 is one, and the two optical fiber units 11 and one strengthening unit 13 are twisted to form a cable.芯10。 Core 10.

1, the optical fiber unit 11 includes an optical fiber 111 and a cured resin layer 113. In one embodiment, the number of the optical fiber 111 in each optical fiber unit 11 is set to 4, and the coating layer of the optical fiber 111 The diameter is 245 μm, and the outer diameter of the optical fiber unit 11 is 0.6 mm. In other embodiments, referring to FIGS. 2 and 3, the number of optical fiber units 111 in the optical fiber unit 11 can also be set to 6 or 8 or other values according to requirements, and the diameter of the coating layer of the optical fiber 111 can be Set between 180 μm and 255, the outer diameter of the optical fiber unit 11 can be controlled between 0.6 and 1.2 mm according to requirements; preferably, the number of optical fibers 111 in each optical fiber unit 11 is 2-12, so The diameter of the coating layer of the optical fiber 111 is between 180 μm and 220 μm or between 245 μm and 255 μm.

The cured resin layer 113 covers the outer circumference of the optical fiber 111. In one embodiment, the cured resin layer 113 adopts the optical fiber 111 with a coating resin. In other embodiments, the optical fiber unit 11 can also be replaced by an optical fiber 111 with a secondary-coated PBT loose tube. The size of the PBT loose tube is 0.9mm-1.2mm, and the PBT loose tube is filled with thixotropic fiber paste for water blocking.

1, the outer diameter of the reinforcing unit 13 is similar to the outer diameter of the optical fiber unit 11. In one embodiment, the outer diameter of the reinforcing unit 13 is the same as the outer diameter of the optical fiber unit 11. The size deviation is less than or equal to 0.05 mm, the material of the reinforcement unit 13 is a glass fiber reinforced plastic rod, the elastic modulus of the reinforcement unit 13 is greater than or equal to 50 GPa, and the tensile strength is greater than or equal to 1100 MPa. In other embodiments, the material of the reinforcement unit 13 may also be an aramid fiber reinforced plastic rod, and the reinforcement unit 13 made of the aramid fiber reinforced plastic rod has an elastic modulus ≥ 54 GPa and a tensile strength ≥ 1600 MPa.

Please refer to FIG. 1, the reinforcing layer 30 is twisted on the outer circumference of the cable core 10, and the twisting direction of the reinforcing layer 30 is opposite to the twisting direction of the cable core 10. In one embodiment, the reinforcing layer 30 is filled with water blocking units 31. In one embodiment, the reinforcement layer 30 is made of aramid fiber filaments, the specification of the reinforcement layer 30 is 800 denier to 1000 denier, the number of the reinforcement layer 30 is 3 to 5, and the water blocking unit 31 For the water blocking yarn arranged in the reinforcing layer 30, the reinforcing layer 30 and the water blocking yarn are simultaneously twisted and arranged on the outer layer of the cable core 10, and the twisting method is unidirectional S twisting, so The water blocking yarn is formed by compounding polyester fiber and super absorbent material or water swellable material. Preferably, the water blocking yarn is set to 2 to 5, and the linear density specification of the water blocking yarn is 500m/kg～ 4500m/kg. In another embodiment, the water blocking unit 31 can also be configured as a water blocking powder of super absorbent resin, and the water blocking powder is coated on the cable core 10 and the reinforcing layer 30 during the stranding process. The surface of the cable core 10 and the reinforcing layer 30 is described. In other embodiments, the reinforcing layer 30 is a water-blocking aramid fiber yarn.

4 and 5, the outer sheath 50 is sleeved on the surface of the reinforcement layer 30. In one embodiment, the outer sheath 50 is formed by extruding high-density polyethylene. The thickness of the sheath 50 is 0.5 mm. The surface of the outer sheath 50 is also provided with concavo-convex lines 51, the concavo-convex lines 51 extending along the longitudinal direction of the air blown microcable 100, in one embodiment, please refer to FIG. 1, the concavo-convex lines 51 are Sawtooth structure keeps the same interval between adjacent sawtooths. In other embodiments, referring to Figures 2, 3 and 4, the concave-convex texture 51 is in a square structure or a circular arc structure, and the depth of the groove of the concave-convex texture 51 is between 0.1 mm and 0.3 mm. The width of the groove is between 0.1 mm and 0.2 mm. In other embodiments, the material of the outer sheath 50 can also be a low-friction polyethylene material or nylon material, which is used to reduce the friction coefficient between the inner wall of the microtube and the surface of the optical cable sheath and improve the air blowing performance. Further, the outer sheath 50 can also be made of polyethylene material containing laser marking powder, and laser printing marks are used to reduce the abrasion of the surface printing marks and the inner wall of the sub-tube during the air blowing process, improve the clarity of the marks, and facilitate identification .

This application also provides a method for preparing the air-blown microcable 100, which includes the following steps:

S1: Select the optical fiber 111, and under the control of constant tension and uniform wire-out, the entire wire is combined and gathered into a mold of a specific specification.

In one embodiment, the number of optical fibers 111 selected is 2-12, and the colored optical fibers 111 can be selected according to actual application requirements. The colors of the optical fibers 111 include, but are not limited to, blue, orange, green, comprehensive, gray, white, and red. , Black, yellow, purple, pink, cyan, in other embodiments, the optical fiber 111 may also be a natural color optical fiber instead of a certain number of colored optical fibers 111.

S2: Coating the resin uniformly on the optical fiber 111, and then curing by ultraviolet light to form the optical fiber unit 11.

In one embodiment, the coating pressure of the resin is controlled to ensure that the resin can evenly coat the surface of the optical fiber 111. In addition, the resin adopts an optical fiber 111 and a coating resin for tape, which is composed of a sensitive oligomer, a photosensitive monomer, a photoinitiator, and an auxiliary agent, and is an environmentally friendly UV-curable film-forming product after finishing. In one embodiment, in order to ensure that no surface resin damage or breakage occurs when the optical fiber unit 11 and the reinforcing unit 13 are twisted, it is necessary to ensure that the optical fiber unit 11 has good flexibility. Therefore, in one embodiment, the cured resin is cured. The viscosity at the first 25°C is 4500mPa·S～5000mPa·S, the cured resin undergoes 2.5% elastic change after curing, the elastic modulus is 550MPa～750MPa at 23°C, and the elongation at break is ≥30%. After the curing is completed, in order to facilitate identification, in one embodiment, a printing mark is performed on the surface of the cured optical fiber unit 11.

S3: The optical fiber unit 11 and the strengthening unit 13 are twisted to form the cable core 10, and the twisting method is unidirectional S twisting.

In one embodiment, the cable core 10 is formed by twisting an optical fiber unit 11 and two strengthening units 13. In other embodiments, the cable core 10 may also use two optical fiber units 11 and one strengthening unit 13 Unit 13 is twisted. In addition, the stranding pitch of the cable core 10 is 300 mm to 500 mm.

S4: The reinforcement layer 30 is twisted outside the cable core 10 and the water blocking unit 31 is filled.

In one embodiment, when the cable core 10 is twisted, the reinforcing layer 30 is twisted outside the cable core 10 and filled with water blocking yarn. The twisting pitch of the reinforcing layer 30 is 400 mm˜800 mm, and the twisting direction of the reinforcing layer 30 is opposite to the twisting direction of the cable core 10. After the stranding is completed, it is ensured that the overall structure after the reinforcement layer 30 is wrapped around the cable core 10 is round.

S5: Extruding the outer sheath 50 on the outer periphery of the reinforcing layer 30 to complete the preparation of the air-blown microcable 100.

The air-blown microcable 100 provided in the present application, compared with the traditional air-blown optical fiber unit, adopts the resin-cured optical fiber unit 11 and the reinforcing unit 13 to twist the cable core 10, which effectively improves the rigidity of the optical cable, and then is coated with a reinforcing layer 30. Further improve the tensile strength of the air-blown micro-cable 100, reduce the risk of bending of the air-blown micro-cable 100, suitable for rapid and long-distance air-blown laying, and improve construction and deployment efficiency. At the same time, a high-viscosity, low-modulus coating resin is used for curing to ensure good flexibility and easy stripping performance of the optical fiber 111 bundle unit. The air-blown microcable 100 provided in the present application is suitable for air-blown laying in microtubes. When the specifications of the microtube are 7.0mm in outer diameter, 5.5mm in inner diameter or 5.0mm in outer diameter and 3.5mm in inner diameter, the microcable is once The air blowing distance is greater than 1km, and the maximum air blowing speed can reach 70m/min.

The above implementation manners are only used to illustrate the technical solutions of the embodiments of the present application and not to limit them. Although the embodiments of the present application are described in detail with reference to the above preferred implementation manners, those of ordinary skill in the art should understand that the technical solutions of the embodiments of the present application can be Modifications or equivalent replacements of the solutions should not depart from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

An air-blown micro-cable, comprising an outer sheath, is characterized in that it further comprises a cable core arranged in the outer sheath, the cable core includes a twisted optical fiber unit and a strengthening unit, the optical fiber unit and The total number of reinforcing units is three, and the outer circumference of the cable core is covered with a reinforcing layer.
The air-blown microcable according to claim 1, wherein the optical fiber unit includes a plurality of optical fibers and a cured resin layer, and the cured resin layer covers the outer circumference of the optical fiber.
The air-blown microcable according to claim 1, wherein the material of the reinforcing unit can be a glass fiber reinforced plastic rod or an aramid fiber reinforced plastic rod.
The air-blown microcable according to claim 1, wherein the material of the reinforcing layer is aramid fiber or glass fiber yarn, and the thickness of the coating of the reinforcing layer is 0.1 mm to 0.2 mm.
The air-blown microcable according to claim 1, wherein the reinforcing layer is filled with water blocking units, and the water blocking units are water blocking yarns filled in the reinforcing layer or coated on the Reinforce the water blocking powder on the surface of the layer.
The air-blown microcable according to claim 1, wherein the surface of the outer sheath is provided with concave-convex patterns extending longitudinally of the air-blown micro-cable, and the circumferential array of the concave-convex patterns is arranged on the outer sheath. The outer surface of the sleeve.
A method for preparing an air-blown microcable, which is characterized in that it comprises the following steps:

Under the tension control, the optical fiber is combined and assembled as a whole to form an optical fiber unit;

Take the optical fiber unit and the strengthening unit and twist to form the cable core;

Stranding and covering the reinforcement layer outside the cable core;

Extruded on the outer periphery of the reinforcement layer to form an outer sheath.
The method for preparing an air-blown microcable according to claim 7, characterized in that: during the preparation of the optical fiber unit, the resin is uniformly coated on the optical fiber, and then cured by ultraviolet light to form the optical fiber unit; the resin includes photosensitive oligomer, Photosensitive monomers, photoinitiators and additives.
8. The method for preparing an air-blown microcable according to claim 7, characterized in that: after the curing of the optical fiber unit is completed, the surface of the cured optical fiber unit is printed and identified.
8. The method for preparing an air-blown microcable according to claim 7, wherein the twisting pitch of the optical fiber unit and the reinforcing unit is 300 mm to 500 mm.